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Physics

Physics
The unit of noise pollution (level) is :

Decibel
Ppm
Decimal
None of these

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Physics
The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be:

2 T
4 T
8 T
1 T

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Physics
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.

0.044444444444444
0.043055555555556
0.042361111111111
Cannot be found from the given information.

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Physics
A fountain pen works on the principle of

Capillary action
Flow of liquids from higher to lower potential
Bernoulli's principle
Viscosity of liquids

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Physics
In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to

0.1 N
1 N
100 N
10 N

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Physics
In the atmosphere ultraviolet rays are absorbed by

Helium
Oxygen
Ozone
Nitrogen

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